US20030166393A1 - Radio signal repeater - Google Patents
Radio signal repeaterDownload PDFInfo
- Publication number
- US20030166393A1 US20030166393A1US10/353,846US35384603AUS2003166393A1US 20030166393 A1US20030166393 A1US 20030166393A1US 35384603 AUS35384603 AUS 35384603AUS 2003166393 A1US2003166393 A1US 2003166393A1
- Authority
- US
- United States
- Prior art keywords
- signals
- antennas
- repeater
- array
- individual
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000004891communicationMethods0.000claimsdescription5
- 230000005540biological transmissionEffects0.000claimsdescription4
- 238000012544monitoring processMethods0.000claimsdescription2
- 238000010295mobile communicationMethods0.000claims4
- 238000003491arrayMethods0.000description5
- 238000000034methodMethods0.000description1
Images
Classifications
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/24—Cell structures
- H04W16/26—Cell enhancers or enhancement, e.g. for tunnels, building shadow
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0491—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas using two or more sectors, i.e. sector diversity
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
- H04B7/15528—Control of operation parameters of a relay station to exploit the physical medium
- H04B7/1555—Selecting relay station antenna mode, e.g. selecting omnidirectional -, directional beams, selecting polarizations
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2603—Arrangements for wireless physical layer control
- H04B7/2606—Arrangements for base station coverage control, e.g. by using relays in tunnels
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/24—Cell structures
Definitions
- the present inventionrelates to repeaters for radio communications, and in particular communications with mobile devices located inside transmission coverage holes such as buildings, and large vehicles such as ferries and trains.
- repeatersare used to receive the signal outside, boost the signal and retransmit inside.
- fixed sectored (60 or 90 degrees coverage) or omni directional antennas (360 degrees coverage)are used to receive the signal outside.
- the disadvantage of these antennasis that they receive all the signals from many sites. This increases the noise level in the WCDMA network which corresponds to a decrease in the network capacity.
- multi sector directional LMU (location monitoring unit) arraysare installed at many locations in a city and are used to provide angle information to locate mobile devices—i.e. terminals.
- Multi Sector Directional LMU Antenna Arraysare small size multi sector units. Each sector consists of a DRA (Dielectric Resonant Antenna) antenna. Each antenna is connected to a receiver and the receiver outputs may be compared.
- DRADielectric Resonant Antenna
- the present inventionprovides a repeater for boosting radio signals having an associated multi-sector directional antenna array comprising a plurality of individual directional antennas, the array having means for comparing signals received by the individual antennas and means for controlling the antennas whereby only a selection of the antennas receiving the best quality signals is operational at any time and the signals from the selected antenna(s) is/are boosted by the repeater.
- the inventionhas been proposed for use in UMTS communications but is more generally applicable.
- the inventionalso provides a communications system using one or more repeaters as described above.
- multi sector directional antenna arraysare used to select the most suitable UMTS 3 g site, at which a transmitter is located, by comparing each receiver output connected to each Multi Sector Directional LMU Antenna Array sector. This technique especially improves the performance on moving vehicles such as ferries and trains where the signal is varying constantly.
- the antenna arrayis a LMU array as described above and is associated with a UMTS 3 g repeater.
- the advantage of a LMU arrayis that it dynamically selects the most suitable site, or transmitter.
- Multi Sector Directional LMU Antenna Arraysare small and can easily be fitted in small places.
- the drawingshows a number of base station transmitter sites ID 1 -ID 4 having stationary transmitters transmitting signals to a LMU array.
- the LMU arraycmprises directional antennas having repective sector coverage areas A-F.
- the LMU arrayis dedicated to a transmitter coverage “hole” H, in this example a large vehicle. Other examples of coverage holes include large buildings such as shopping centres, trains and other locations at which signals from the transmitter sites are weak.
- the arrayhas an associated repeater which boosts received signals from the base station transmitters before retransmitting to mobile terminals within the vehicle, one of which is indicated by reference numeral 1 .
- the array and repeaterare preferably provided as a n integral unit 2 , comprising the antenna array 3 , a controller 4 and the repeater 5 .
- the controllerhas means for comparing the signals received by the individual antennas from multiple antennas at ID 1 -ID 4 . Depending on the relative strengths of the received signals, the controller will select the antenna or antennas receiving the best quality signals to be boosted by the repeater for onward transmission to terminals 1 .
- antenna Ais the best choice for the Site ID 1
- antenna Bis for Site ID 2
- antenna B, Care for Site ID 3
- antenna Dis for site ID 4 .
- antennas of the arrayare used at any one time.
- the systemshall use both antenna A and antenna B.
- the antenna Awill be switched off dynamically so that signals from site ID 1 are no longer retransmitted. The hand over from one site to another will be carried out according to existing standards.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
- Radio Relay Systems (AREA)
- Details Of Aerials (AREA)
- Radio Transmission System (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
- Near-Field Transmission Systems (AREA)
Abstract
Description
- The present invention relates to repeaters for radio communications, and in particular communications with mobile devices located inside transmission coverage holes such as buildings, and large vehicles such as ferries and trains. In certain large buildings and vehicles, repeaters are used to receive the signal outside, boost the signal and retransmit inside. Currently, fixed sectored (60 or 90 degrees coverage) or omni directional antennas (360 degrees coverage) are used to receive the signal outside. The disadvantage of these antennas is that they receive all the signals from many sites. This increases the noise level in the WCDMA network which corresponds to a decrease in the network capacity. There are now available multi sector directional LMU (location monitoring unit) arrays. They are installed at many locations in a city and are used to provide angle information to locate mobile devices—i.e. terminals. A terminal can then be offered location-based services such as directions to the nearest bank or restaurant. Multi Sector Directional LMU Antenna Arrays are small size multi sector units. Each sector consists of a DRA (Dielectric Resonant Antenna) antenna. Each antenna is connected to a receiver and the receiver outputs may be compared.[0001]
- The present invention provides a repeater for boosting radio signals having an associated multi-sector directional antenna array comprising a plurality of individual directional antennas, the array having means for comparing signals received by the individual antennas and means for controlling the antennas whereby only a selection of the antennas receiving the best quality signals is operational at any time and the signals from the selected antenna(s) is/are boosted by the repeater. As a result of only certain of the antennas being selected for operation, only signals from certain of the transmitters communicating with the array will be boosted for onward transmission. The invention has been proposed for use in UMTS communications but is more generally applicable.[0002]
- The invention also provides a communications system using one or more repeaters as described above.[0003]
- In a preferred system according to the invention, several multi sector directional antenna arrays, one for each large vehicle/building etc, are used to select the most suitable UMTS 3 g site, at which a transmitter is located, by comparing each receiver output connected to each Multi Sector Directional LMU Antenna Array sector. This technique especially improves the performance on moving vehicles such as ferries and trains where the signal is varying constantly.[0004]
- Peferably, the antenna array is a LMU array as described above and is associated with a UMTS 3 g repeater. The advantage of a LMU array is that it dynamically selects the most suitable site, or transmitter.[0005]
- The Multi Sector Directional LMU Antenna Arrays are small and can easily be fitted in small places.[0006]
- There are two major applications for this invention. Firstly it can be used on a moving large vehicle e.g. a ferry travelling on a harbour such as Hong Kong, London or Sydney. Use of Multi Sector Directional LMU Antenna Arrays with the repeaters reduces the noise level in the network by selecting only one site with the best signal conditions dynamically. They are easy to mount on the ferries and fast moving trains. Secondly, they can be deployed on fixed structures such as shopping centres. The major advantage is to select the most suitable site in the network to retransmit inside the building.[0007]
- As an example, a Multi Sector Directional LMU Antenna Array pattern and site locations are shown in the accompanying drawing.[0008]
- The drawing shows a number of base station transmitter sites ID[0009]1-ID4 having stationary transmitters transmitting signals to a LMU array. The LMU array cmprises directional antennas having repective sector coverage areas A-F. The LMU array is dedicated to a transmitter coverage “hole” H, in this example a large vehicle. Other examples of coverage holes include large buildings such as shopping centres, trains and other locations at which signals from the transmitter sites are weak. The array has an associated repeater which boosts received signals from the base station transmitters before retransmitting to mobile terminals within the vehicle, one of which is indicated by
reference numeral 1. - The array and repeater are preferably provided as a n[0010]
integral unit 2, comprising theantenna array 3, acontroller 4 and therepeater 5. The controller has means for comparing the signals received by the individual antennas from multiple antennas at ID1-ID4. Depending on the relative strengths of the received signals, the controller will select the antenna or antennas receiving the best quality signals to be boosted by the repeater for onward transmission toterminals 1. - The antenna array will in effect select the most appropriate site or sites according to their relative signal strengths as described above. According to the figure, antenna A is the best choice for the[0011]
Site ID 1, antenna B is forSite ID 2, antenna B, C are forSite ID 3 and antenna D is forsite ID 4. Thus not all of the antennas of the array are used at any one time. - As the vehicle moves from[0012]
site ID 1 toSite ID 2, in the direction of arrow Z, the system shall use both antenna A and antenna B. As the vehicle moves further away from thesite ID 1, the antenna A will be switched off dynamically so that signals from site ID1 are no longer retransmitted. The hand over from one site to another will be carried out according to existing standards.
Claims (10)
1. A repeater for boosting radio signals having an associated multi-sector directional antenna array comprising a plurality of individual directional antennas, the array having means for comparing signals received by the individual antennas and means for controlling the antennas whereby only a selection of the antennas receiving the best quality signals is operational at any time and the signals from the selected antenna(s) is/are boosted by the repeater.
2. A repeater as claimed inclaim 1 in which the repeater and associated antenna array are integrated in a single device.
3. A repeater as claimed inclaim 1 arranged to boost UMTS signals.
4. A repeater as claimed inclaim 1 in which the antenna array is a location monitoring unit array.
5. A mobile communications system including a plurality of sationary radio transmitters exchanging radio signals with a plurality of mobile terminals in which an area of poor reception from the transmitters is provided with a repeater as claimed inclaim 1 .
6. A system as claimed inclaim 5 in which at least one building is provided with a repeater for boosting radio signals having an associated multi-sector directional antenna array comprising a plurality of individual directional antennas, the array having means for comparing signals received by the individual antennas and means for controlling the antennas whereby only a selection of the antennas receiving the best quality signals is operational at any time and the signals from the selected antenna(s) is/are boosted by the repeater.
7. A system as claimed inclaim 5 in which at least one vehicle is provided with a repeaterfor boosting radio signals having an associated multi-sector directional antenna array comprising a plurality of individual directional antennas, the array having means for comparing signals received by the individual antennas and means for controlling the antennas whereby only a selection of the antennas receiving the best quality signals is operational at any time and the signals from the selected antenna(s) is/are boosted by the repeater.
8. A mobile communications system including a plurality of radio transmitters exchanging radio signals with a plurality of mobile terminals in which a multi sector directional antenna array is used to select an appropriate transmitter or transmitters for communication with one or more mobile terminals in a restricted geographical area, the array having means for comparing signals received by the individual antennas from multiple transmitters and selecting a transmitter or transmitters based on the quality of received signals, and being connected to a repeater for amplifying signals for transmission to the mobile terminal(s).
9. A mobile communications system as claimed inclaim 8 in which the restricted geographical area is a building.
10. A mobile communications system as claimed inclaim 8 in which the restricted geographical area is a vehicle.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0201987AGB2384652B (en) | 2002-01-29 | 2002-01-29 | Improved communications with mobile terminals in restricted areas |
| GB0201987.5 | 2002-01-29 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| US20030166393A1true US20030166393A1 (en) | 2003-09-04 |
| US7327980B2 US7327980B2 (en) | 2008-02-05 |
Family
ID=9929940
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US10/353,846Expired - LifetimeUS7327980B2 (en) | 2002-01-29 | 2003-01-29 | Radio signal repeater |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US7327980B2 (en) |
| EP (1) | EP1333596B1 (en) |
| CN (1) | CN1436015A (en) |
| AU (1) | AU2003200262B2 (en) |
| DK (1) | DK1333596T3 (en) |
| ES (1) | ES2398954T3 (en) |
| GB (1) | GB2384652B (en) |
| NO (1) | NO20030455L (en) |
| NZ (1) | NZ523876A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040166802A1 (en)* | 2003-02-26 | 2004-08-26 | Ems Technologies, Inc. | Cellular signal enhancer |
| US20060205343A1 (en)* | 2005-03-11 | 2006-09-14 | Runyon Donald L | Wireless repeater with feedback suppression features |
| US20070087695A1 (en)* | 2005-10-17 | 2007-04-19 | Searete Llc, A Limited Liability Corporation Of The State Of Delaware | Mobile directional antenna |
| US20150372747A1 (en)* | 2013-01-30 | 2015-12-24 | Telefonaktiebolaget L M Ericsson (Publ) | Relay device and associated vehicle and method |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4595379B2 (en)* | 2004-04-30 | 2010-12-08 | 日本電気株式会社 | Mobile communication service system and method |
| GB2427789B (en)* | 2005-06-24 | 2008-04-23 | Toshiba Res Europ Ltd | Repeater apparatus |
| EP1982441A1 (en) | 2005-12-16 | 2008-10-22 | Nokia Corporation | A relay |
| US8055270B1 (en)* | 2005-12-23 | 2011-11-08 | At&T Mobility Ii Llc | System and method for providing location information for a mobile handset |
| US8738103B2 (en) | 2006-07-18 | 2014-05-27 | Fractus, S.A. | Multiple-body-configuration multimedia and smartphone multifunction wireless devices |
| US8385926B2 (en) | 2006-12-11 | 2013-02-26 | Telefonaktiebolaget L M Ericsson (Publ) | Method and apparatus for generating coverage in a cellular network |
| GB2481614B (en)* | 2010-06-30 | 2017-11-22 | Fujitsu Ltd | Coverage hole compensation in wireless communication networks |
| GB2518621A (en)* | 2013-09-25 | 2015-04-01 | Vodafone Egypt | Telecommunications system and method |
| GB201421388D0 (en)* | 2014-12-02 | 2015-01-14 | Kolokotronis Dimitris | Dynamic azimuth adjustment for cellular repeater antenna systems |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4806938A (en)* | 1984-11-20 | 1989-02-21 | Raytheon Company | Integrated self-adaptive array repeater and electronically steered directional transponder |
| US5963847A (en)* | 1995-10-26 | 1999-10-05 | Ntt Mobile Communications Network Inc. | Booster system |
| US20020123306A1 (en)* | 2001-03-05 | 2002-09-05 | Harvey Masoian | Channelized booster amplifier for cellular communications |
| US20030045230A1 (en)* | 2001-08-30 | 2003-03-06 | Haim Weissman | Repeater with diversity transmission |
| US20030123401A1 (en)* | 2001-11-20 | 2003-07-03 | Dean Richard F. | Reverse link power controlled repeater |
| US6731904B1 (en)* | 1999-07-20 | 2004-05-04 | Andrew Corporation | Side-to-side repeater |
| US6993287B2 (en)* | 2003-03-04 | 2006-01-31 | Four Bars Clarity, Llc | Repeater system for strong signal environments |
| US7123911B1 (en)* | 2002-08-08 | 2006-10-17 | Sprint Spectrum L.P. | Method and system of wireless signal repeating |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6365723A (en)* | 1986-09-05 | 1988-03-24 | Mitsubishi Electric Corp | mobile radio communication system |
| US5684491A (en)* | 1995-01-27 | 1997-11-04 | Hazeltine Corporation | High gain antenna systems for cellular use |
| US5819182A (en)* | 1995-11-13 | 1998-10-06 | Pacific Communication Sciences, Inc. | Method and apparatus for improving receiver performance in a land mobile communications system |
| US5815116A (en)* | 1995-11-29 | 1998-09-29 | Trw Inc. | Personal beam cellular communication system |
| CA2224035A1 (en)* | 1996-12-19 | 1998-06-19 | J. Leland Langston | Repeater node network system and method |
| GB2347019A (en)* | 1999-02-08 | 2000-08-23 | Motorola Ltd | An antenna array system |
| US6603976B1 (en)* | 1999-08-03 | 2003-08-05 | Ericsson, Inc. | Architecture for TOA positioning with LMU control functionality in BSC |
| CA2397430A1 (en) | 2000-01-14 | 2001-07-19 | Breck W. Lovinggood | Repeaters for wireless communication systems |
| EP1273108B1 (en)* | 2000-04-07 | 2005-08-03 | Nokia Corporation | Multi-antenna transmission method and system |
- 2002
- 2002-01-29GBGB0201987Apatent/GB2384652B/ennot_activeExpired - Lifetime
- 2003
- 2003-01-28DKDK03250514.1Tpatent/DK1333596T3/enactive
- 2003-01-28ESES03250514Tpatent/ES2398954T3/ennot_activeExpired - Lifetime
- 2003-01-28EPEP03250514Apatent/EP1333596B1/ennot_activeExpired - Lifetime
- 2003-01-29USUS10/353,846patent/US7327980B2/ennot_activeExpired - Lifetime
- 2003-01-29CNCN03120093Apatent/CN1436015A/enactivePending
- 2003-01-29NONO20030455Apatent/NO20030455L/ennot_activeApplication Discontinuation
- 2003-01-29AUAU2003200262Apatent/AU2003200262B2/ennot_activeExpired
- 2003-01-29NZNZ523876Apatent/NZ523876A/ennot_activeIP Right Cessation
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4806938A (en)* | 1984-11-20 | 1989-02-21 | Raytheon Company | Integrated self-adaptive array repeater and electronically steered directional transponder |
| US5963847A (en)* | 1995-10-26 | 1999-10-05 | Ntt Mobile Communications Network Inc. | Booster system |
| US6731904B1 (en)* | 1999-07-20 | 2004-05-04 | Andrew Corporation | Side-to-side repeater |
| US20020123306A1 (en)* | 2001-03-05 | 2002-09-05 | Harvey Masoian | Channelized booster amplifier for cellular communications |
| US20030045230A1 (en)* | 2001-08-30 | 2003-03-06 | Haim Weissman | Repeater with diversity transmission |
| US20030123401A1 (en)* | 2001-11-20 | 2003-07-03 | Dean Richard F. | Reverse link power controlled repeater |
| US7123911B1 (en)* | 2002-08-08 | 2006-10-17 | Sprint Spectrum L.P. | Method and system of wireless signal repeating |
| US6993287B2 (en)* | 2003-03-04 | 2006-01-31 | Four Bars Clarity, Llc | Repeater system for strong signal environments |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040166802A1 (en)* | 2003-02-26 | 2004-08-26 | Ems Technologies, Inc. | Cellular signal enhancer |
| US20060205343A1 (en)* | 2005-03-11 | 2006-09-14 | Runyon Donald L | Wireless repeater with feedback suppression features |
| US20070087695A1 (en)* | 2005-10-17 | 2007-04-19 | Searete Llc, A Limited Liability Corporation Of The State Of Delaware | Mobile directional antenna |
| US20110028099A1 (en)* | 2005-10-17 | 2011-02-03 | Searete Llc | Mobile directional antenna |
| US20150372747A1 (en)* | 2013-01-30 | 2015-12-24 | Telefonaktiebolaget L M Ericsson (Publ) | Relay device and associated vehicle and method |
| US9577738B2 (en)* | 2013-01-30 | 2017-02-21 | Telefonaktiebolaget Lm Ericsson (Publ) | Relay device and associated vehicle and method |
Also Published As
| Publication number | Publication date |
|---|---|
| US7327980B2 (en) | 2008-02-05 |
| GB2384652B (en) | 2005-11-23 |
| EP1333596B1 (en) | 2012-11-07 |
| HK1055654A1 (en) | 2004-01-16 |
| EP1333596A1 (en) | 2003-08-06 |
| NO20030455L (en) | 2003-07-30 |
| GB0201987D0 (en) | 2002-03-13 |
| DK1333596T3 (en) | 2013-02-11 |
| AU2003200262B2 (en) | 2007-04-26 |
| GB2384652A (en) | 2003-07-30 |
| AU2003200262A1 (en) | 2003-08-14 |
| NZ523876A (en) | 2004-09-24 |
| ES2398954T3 (en) | 2013-03-22 |
| CN1436015A (en) | 2003-08-13 |
| NO20030455D0 (en) | 2003-01-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| AU701483B2 (en) | Polarisation diversity phased array cellular base station and associated methods | |
| US20020042290A1 (en) | Method and apparatus employing a remote wireless repeater for calibrating a wireless base station having an adaptive antenna array | |
| AU683368B2 (en) | Phased array cellular base station and associated methods for enhanced power efficiency | |
| US8244173B2 (en) | RF repeater | |
| AU712156B2 (en) | Wideband digitization systems and methods for cellular radiotelephones | |
| US7327980B2 (en) | Radio signal repeater | |
| SE467518B (en) | MOBILE RADIO COMMUNICATION SYSTEM WITH A REPEAT STATION NETWORK | |
| EP1564907A2 (en) | Wireless telephone distribution system with time and space diversity transmission | |
| WO2005062971A3 (en) | Adaptive antenna for use in wireless communication systems | |
| WO2002023748A1 (en) | Wireless communication network | |
| JP2001522160A (en) | Non-terrestrial cellular mobile telecommunications station | |
| EP0952747A3 (en) | Dual mode base station antenna with wide and narrow beams | |
| US7123911B1 (en) | Method and system of wireless signal repeating | |
| JP3125744B2 (en) | Mobile satellite communication terminal | |
| US20210058754A1 (en) | In-vehicle communication system | |
| JPH10504955A (en) | Receiver with antenna array | |
| US7123941B2 (en) | Radio LAN master station system | |
| JPH10163937A (en) | Antenna switching control method | |
| US5923304A (en) | Omnidirectional antenna scheme | |
| Lee | An Analysis of an RF Link Budget and RSSI Circuit Design for Long-Range Communications | |
| JPH0884148A (en) | Wireless LAN transceiver | |
| JP3018499U (en) | Transmission distributed antenna | |
| JP2006121525A (en) | All direction spatial diversity receiving apparatus | |
| MXPA96003601A (en) | Station of cellular base of phase formation and associated methods for better energy efficiency |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| AS | Assignment | Owner name:HUTCHINSON WHAMPOA THREE GIP (BAHAMAS) LIMITED, BA Free format text:ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:HEPSAYDIR, EROL;REEL/FRAME:014060/0104 Effective date:20030218 | |
| STCF | Information on status: patent grant | Free format text:PATENTED CASE | |
| FPAY | Fee payment | Year of fee payment:4 | |
| FPAY | Fee payment | Year of fee payment:8 | |
| MAFP | Maintenance fee payment | Free format text:PAYMENT OF MAINTENANCE FEE, 12TH YEAR, LARGE ENTITY (ORIGINAL EVENT CODE: M1553); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY Year of fee payment:12 |